20 C.F.R. § 702.103
Effect of establishment of suboffices and jurisdictional areas
Whenever the Director establishes a suboffice or jurisdictional area, those reports, records, or other documents with respect to processing of claims that are required to be filed with the district director of the compensation district in which the injury or death occurred, may instead be required to be filed with the suboffice, or office established for the jurisdictional area.